. The article presents the results of studies on the effectiveness of various methods and regimes of irrigation, fertilizer when grown in conditions of thickening of onion variety Batyr plants in the conditions of the northern Steppe of Ukraine. When using drip irrigation with a differentiated moisture regime, the largest increase in the yield of the bulbs relative to the control (Bogar) was noted – 98.1 %. The highest marketable yield is ensured by the use of drip irrigation with a differentiated moisture regime (80-75 % of NH to bulb formation, 70-65 % of NH before feather lodging) against the background of P45K30 (locally) and two additional dressings with nitrogen N15 (fertigation) and foliar complex fertilizer Reakom (3 l / ha), with a plant density of 1000 thousand pcs / ha – 55.4 t / ha. When studying the processes of water consumption, the positive effect of fertilizer and thickening of crops on the coefficients of water consumption and irrigation efficiency was established. At the best option, the coefficient of water consumption was at the level of 74.9 m3 / t, the coefficient of irrigation efficiency - 42.8 m3 / t, which is lower than the standard by 45.9 and 84.6 %, respectively. According to the results of the statistical analysis, close correlation feedback r = –0.74 was established between the onion yield and the coefficient of water consumption.
bulb onions, irrigation methods and regimes, fertilizers, plant density, commercial yield, water consumption